Editing Mesud I (section)

{{Infobox royalty
| type         = monarch
| name         = Mesud I
| more         = 
| image        = File:Rukn al-Din Mas'ud I. AH 510-551 (AD 1116-1156) Half-length facing bust of Byzantine emperor.jpg
| image_size   = 300 
| caption      = Coinage of Rukn al-Din Mas'ud I. AH 510-551 (AD 1116-1156). ''Obverse'': Half-length facing bust of Byzantine emperor.
| succession   = [[List of Seljuk sultans of Rûm|Seljuq Sultan of Rum]]
| reign        = 1116–1156
| coronation   = 
| predecessor  = [[Malik Shah (Rûm)|Malik Shah]]
| successor    = [[Kilij Arslan II]]
| full name    = '''Rukn al-Dīn Mas'ūd Klada'''
| house        = [[Seljuq dynasty|House of Seljuq]]
| spouse       =
| issue        = [[ Kilij Arslan II]]
| father       = [[Kilij Arslan I]]
| mother       = 
| birth_date   = 
| birth_place  = 
| death_date   = 1156
| death_place  = 
| place of burial = 
| religion     = [[Islam]]
}}

'''Rukn al-Dīn Mesud Klada ibn Kilij Arslan''' or '''Mesud I''' (Modern {{langx|tr|I. Rükneddin Mesud}} or ''Masud'' ({{Langx|fa|ركن الدین مسعود}}) was the sultan of the [[Sultanate of Rum|Sultanate of Rûm]] from 1116 until his death in 1156.